“…We reviewed the method and results sections of articles for which the title mentioned a treatment for problem behavior ( N = 45) to identify the source of baseline data. Of the articles for which the source could be determined ( N = 41), we identified 15 articles that used the data from the test condition in the FA as baseline (e.g., Torres‐Viso, Strohmeier, & Zarcone, ); 12 articles that collected new baseline data by conducting additional sessions of a test condition (following completion of the FA) using contingencies identical to those in the FA (e.g., Fisher et al, ); 11 articles that conducted additional sessions (following completion of the analysis) using a modified test condition from the FA (e.g., Verriden & Roscoe, ); and three articles that used a combination of the above methods across participants (e.g., Slocum, Grauerholz‐Fisher, Peters, & Vollmer, ; list of articles available from the first author). Although this cursory review sampled only a few years of data, the outcome indicates that the source of baseline data used by researchers in treatment evaluations continues to vary.…”